My internet service is run into my mechanical room where they have a POE 24v ubiquiti powering their satellite dish.
They did provide you with something

The model/type of that satellite may help.
In any case, this is the general theory:
- if you would have cable/dsl: your ISP provides a modem (or modem/router). It gets "connected" to the ISP (WAN side). In 90% of the cases, your ISP hands out "public" DHCP WAN IP addresses. Which means you have a public addressable IP, on which you can then "ent" your OpenVPN server. So where-ever you are, you can reach your "home". Unfortunately, the D in DHCP stands for Dynamic, which means that every (predefined) period of time, your IP is "re"-leased. You càn have the same IP back, or your neighboor, or someone else at the other side of your state. In 10% of the cases you might be lucky (like me) and your DHCP is kinda "stable", and it doesn't change (like with me in the past 4 years). which has its advantages (eg I don't have to reconfigure my openvpn client configuration files), however if I'm under attack, I can't simply "reboot" my modem to get a new one. With DHCP, you seen some "dynamic" DNS to "update" your configuration records accordingly the WAN IP change. Many 3g/4g have the same practice: every x minutes you pop-up on the internet with another IP address. Handy as a "client", but annoying when being a "server".
- in case of satellite (I've read some topics here on the forum), many ISP employ double NAT, which means that your ISP gives you an "internal" (pseudo) WAN IP. What does that mean: you'll get an ip like 10.x.x.x or 172.x.x.x. These are unroutable ip addresses which you simply cannot contact FROM the outside internet.
Does that mean you have to be "locked out". No. You can setup any "server" in your network to dial-out to any "VPS" openVPN-wise, and
try to keep that line open. Through that same VPS with OpenVPN Server, you "dial" in from your handheld/mobile when being out-of-the-house. By having this jumpbox, you can "jump" from the internet into your house. Only pitfall is the "try" to keep that line open. If your ISP resets the communication (eg when that pseudo IP address gets recycled - it will run in DHCP mode too!), then the VPN software should re-establish the connection.
But apart from that, it "depends" on what you have received from the ISP, but there are ample solutions for almost every challenge
Hope this helps!
CC